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Table 6 Outcomes of chronic obstructive pulmonary disease patients, according to the number of emergency department visits, stratified by state

From: Frequent utilization of the emergency department for acute exacerbation of chronic obstructive pulmonary disease

Variables 1 ED visit 2 ED visits ≥ 3 ED visits P value
California     
 Number of ED visits for COPD, no. 33,741 16,594 26,100
 30-day ED revisit rate for COPD, % (95% CI)* 11.1 (10.6-11.6) 31.7 (31.2-32.3) <0.001
 Hospitalization rate for COPD, % (95% CI) 55.7 (55.2-56.2) 54.6 (53.9-55.4) 54.5 (53.9-55.1) <0.001
 Near-fatal event rate, % (95% CI) 6.8 (6.5-7.1) 9.2 (8.7-9.6) 9.6 (9.2-9.9) <0.001
Florida     
 Number of ED visits for COPD, no. 35,657 17,416 25,228
 30-day ED revisit rate for COPD, % (95% CI)* 9.8 (9.4-10.3) 28.2 (27.6-28.8) <0.001
 Hospitalization rate for COPD, % (95% CI) 68.6 (68.1-69.0) 71.7 (71.0-72.3) 69.9 (69.3-70.4) <0.001
 Near-fatal event rate, % (95% CI) 4.9 (4.7-5.1) 7.3 (6.9-7.7) 9.9 (9.5-10.3) <0.001
Nebraska     
 Number of ED visits for COPD, no. 2009 1060 1301  
 30-day ED revisit rate for COPD, % (95% CI)* 8.6 (7.0-10.4) 27.2 (24.8-29.7) <0.001
 Hospitalization rate for COPD, % (95% CI) 52.5 (50.3-54.7) 56.6 (53.6-59.6) 53.0 (50.2-55.7) 0.08
 Near-fatal event rate, % (95% CI) 6.9 (5.8-8.1) 7.9 (6.4-9.7) 11.2 (9.6-13.1) <0.001
  1. Abbreviations: COPD chronic obstructive pulmonary disease, ED emergency department, IQR interquartile range CI confidence interval.
  2. *Excluding the index ED visits and hospitalizations.